The problems comes from the fact that humans not only form groups naturally, but form hierarchical groups, that means there are always those who feel they were designed to be at the top of the pyramid. Unfortunately, there's a clash of Brains vs Brawn, once upon a time, Brawn decided who was in charge, and it still causes a problem these days.
From the point of the Shivans, it could be that there is no such inter-competition for position. However, even bees do not go out and sting everything they encounter, they even have symbiotic relations with some other insects.